Paper 3 Flashcards
1
Q
an ecologist captured insects from a number of sites on the island
suggest how they decided where to take their sample
A
- draw grid over map of area
- select coordinates at random
2
Q
suggest the advantage of using the fluorescent powder in an experiment
A
- glows brightly with UV making visible
- able to easily identify marked animals
3
Q
A
- scientists removed large number of insects from same area
- affecting ratio of marked to unmarked
4
Q
A
- some starch already digested in mouth
- same amount of digestion without chewing at the end
- faster digestion of chewed starch
5
Q
A
- rank all STs in ascending order
- find value with same number of people above and below
6
Q
A
- faulty proteins recognised as foreign antigen
- T cell will bind to faulty protein
- T cell stimulates clonal selection of B cells
- release antibodies against faulty protein
7
Q
A
- to kill any bacteria on surface of seeds
- so only added fungus has effect
8
Q
A
only nitrate affects growth
9
Q
A
- so effects of fungus seen
- so effects of nitrate / ammonium alone could be seen
10
Q
A
- weigh at regular intervls during drying
- to see if weghings become constant
11
Q
what conclusions can be drawn about the effects of the fungus on growth of pea plants
A
- fungus inc growth of shoots and roots
- greater growth with nitrate
12
Q
what conclusions can be drawn from the table about the effects of nitrate fertiliser and ammonium fertiliser on the growth of pea plants
A
- similar dry masses for roots and shoots
- no sig diff as sd bars overlap
13
Q
A
- water content of tissue varies
- dry mass measures increase in biological material
14
Q
which treatment gave best result in commercial terms
A
- fungus with nitrate containing fertiliser
- larges shoot to root ratio
- and largest dry mass of shoot
15
Q
A
- keeps pop low
- pests dont develop resistance
- no bioaccumulation
- only needs 1 application
- specific to 1 pest
- can be used in organic farming
16
Q
A
- cost of treatment
- takes long time to act
- 2 spotted micte not completely removed
- may become pest
17
Q
use knowledge of photosynth and resp to explain data
A
- photosynth only during day time
- net carbon dioxide uptake during day
- at ground level more respiration
- carbon dioxide produced at ground level taken up by leaves
18
Q
A
- gives rise to new plants
- must be able to develop into diff tissues
19
Q
A
- meiosis
- independent assortment / crossing over
- random fertilisation
20
Q
A
combustion
21
Q
A
- loss of energy between trophic levels
- as a result of respiration
22
Q
A
will work in all weather conditions
23
Q
A
so shrew comes into contact with glue
24
Q
A
- shrew enters without leaving hair
- individual shrew enters more than one tube
25
Q
A
- rules out differences due to changes in population
- produced by deaths, biths etc
